Tetrameryx sp.—Four-horned Pronghorn

Discussion. Tebedge (1988:206) assigned a juvenile posterior horn core to this genus
based on the prominent groove on the posterior horn, the strong divergence of the horns
antero-posteriorly, and the elliptical shape of the posterior horn in cross-section." I
consider it most likely to represent Stockoceros and have not added it to the Dark Canyon
faunal list.

Van Devender et al. (1985) listed Tetrameryx sp. from La Brisca, noting that the tooth
was larger than those of Stockoceros, Antilocapra, and Capromeryx, but that the enamel pattern was similar to antilocaprids—and thus they assigned it to Tetrameryx.